TEMPE, Ariz. — Every time Kole Calhoun steps into the batter’s box, particularly this spring, you might see something different.

For a reporter who watches Calhoun’s at-bats every day, it’s become a pet project. Calhoun’s swing — notably his batting stance — has been a persistent subject since the beginning of last season when, in an attempt to hit more fly balls, the Angels’ right fielder instead found himself completely out of whack. Since then, his stance has been on a constant, almost dizzying evolution.

Here’s his stance last March, when he arrived at camp seeking to increase his fly-ball rate. Calhoun joined the wave of batters looking to launch, and he sought to improve on 2017, which was the worst (but still league-average) offensive season of his career.

Calhoun rests his bat on his left shoulder and stands almost completely upright, with most of his weight on his back foot, before he goes into his leg kick and tries to...